Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income (loss), including noncontrolling interests	$ 66,526	$ 26,635
Adjustments to reconcile net income (loss), including noncontrolling interests to net cash provided by operating activities
Depreciation and amortization	72,492	92,143
Asset impairment charge and dry hole expense	143
Amortization of deferred financing costs	2,355	1,981
Stock compensation expense	1,838	2,953
Amortization of debt discount	1,611	2,207
Deferred income taxes	(2,673)	9,329
Excess tax benefit from stock-based compensation	340	969
Gain on investment in Cal Dive common stock		(753)
(Gain) loss on sale or acquisition of assets	1,478	(16)
Loss on early extinguishment of debt	17,127
Unrealized loss (gain) and ineffectiveness on derivative contracts, net	2,453	(318)
Changes in operating assets and liabilities:
Accounts receivable, net	11,526	(381)
Other current assets	15,360	18,869
Income tax payable	23,233	(2,338)
Accounts payable and accrued liabilities	(59,079)	(58,747)
Oil and gas asset retirement costs	(18,357)	(8,160)
Other noncurrent, net	(2,568)	692
Net cash provided by operating activities	133,805	85,065
Cash flows from investing activities:
Capital expenditures	(101,744)	(34,488)
Distributions from equity investments, net	5,943	480
Proceeds from sale of Cal Dive common stock		3,588
Decrease (increase) in restricted cash	922	613
Net cash used in investing activities	(94,879)	(29,807)
Cash flows from financing activities:
Early extinguishment of Senior Unsecured Notes	(209,500)
Borrowing under revolving credit facility	100,000
Issuance of Convertible Senior Notes due 2032	200,000
Repurchase of Convertible Senior Notes due 2025	(143,945)
Proceeds from Term Loan A	100,000
Repayment of Term Loan	(750)	(1,082)
Repayment of MARAD borrowings	(2,409)	(2,294)
Deferred financing costs	(6,337)
Repurchases of common stock	(991)	(927)
Excess tax benefit from stock-based compensation	(340)	(969)
Exercise of stock options, net and other	381	(70)
Net cash used in financing activities	36,109	(5,342)
Effect of exchange rate changes on cash and cash equivalents	(1,051)	(470)
Net (decrease) increase in cash and cash equivalents	73,984	49,446
Cash and cash equivalents:
Balance, beginning of year	546,465	391,085
Balance, end of period	$ 620,449	$ 440,531